So you do not want this button to appear nor you need the functionality of the “Ask a question about this product” button in your VirtueMart store (I’m talking about 1.1.9 version).
Here’s how to remove “Ask a question about this product” button:
1. Open \components\com_virtuemart\themes\default\templates \product_details\flypage.tpl.php
2. Near row 43 find echo $ask_seller and comment it out (just add // before echo, so it looks like //echo $ask_seller )
3. Save the file and done!